2021/11/16 (Tuesday)
- Lab in-personnel: Himangshu, Matt
| Status | Beginning Run 75. |
|---|---|
| 1K Pot isolated. MB in pit. Cryostat vacuum jacket (CVJ) pumped out. | |
| Pumping IVC for a week. | |
| 1125 | Turbo on IVC = 19 nbar. With Turbo valved out for 1 minute, IVC = 640 nbar. |
| 1140 | Check contents of warm LN2 Trap 2: 15.7 mbar. Pump out with Scroll Pump. |
| 1200 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.2% |
| 1205 | Increase V6 → 12.4% to restart flow |
| 1215 | Increase V6 → 12.5% to restart flow |
| 1230 | Increase V6 → 12.6% to restart flow |
| 1255 | Increase V6 → 12.7% to restart flow |
| 1300 | Increase V6 → 12.8% to speed up flow. We'll run it a little longer at increased flow rate. |
| 1315 | Stop cleaning through Trap 1 after 75 min. G2 flow pressure was 580-740 mbar. Pump mixture to dump. Removed 8.5 mbar. |
| 1350 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 12.5% |
| 1405 | Increase V6 → 12.8% to restart flow |
| 1417 | Checked flow rate and it looks fine |
| 1500 | Stop cleaning through Trap 2 after 70 min. G2 flow pressure was 588-602 mbar (not very high). Pump mixture to dump. Removed 6.1 mbar. |
| 1650 | Turn off 3He pump |